<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="../script/jquery-1.7.2.js"></script>
<script type="text/javascript">
	//$就是一个函数方法==> 封装好的
	$(function(){
		alert($);
	});


</script>
</head>
<body>

	<button id="btn">Button</button>

</body>
</html>